Just to confirm - I'm seeing the same problem with the iPad 2, and Apple HDMI adaptor. This happens with Goat Up, Minotron, Minotaur Rescue and Deflex.

To add a little more detail - for Goat Up, Minotron and Deflex the game bombs a fraction after touching the screen, and until then will run ok. For Minotaur Rescue the game game bombs just as the Ataurus logo animates.

For Minotron I can leave the HDMI unplugged, start a game, and then re-attach the HDMI cable, to get video out but then there is no audio.

My guess is that the problem is audio related - it seems that they crash a split second after each title starts generating sound.

*edit* oh, and while I'm here - any chance of adding full screen 720p (iPhone4 and iPad1) / 1080p (iPad2) using the HDMI adaptor? Minotron would look amazing